/// <summary>
/// 测试struct与null的关系
/// </summary>
private void TestStructNull()
{
//SimpleTestStruct strcutNull = null; // Assets/StructAndClass/StructAndClass.cs(98,33): error CS0037: Cannot convert null to `SimpleTestStruct' because it is a value type
// SimpleTestStruct simple = new SimpleTestStruct();
// simple = null; 不能赋空值, 报错同上
//SimpleTestStruct simple;
//simple = null; 不能赋空值, 报错同上
SimpleTestStruct?strcutNull = null; // V struct 赋空值的正确做法
Debug.Log(strcutNull.ToString()); // 可以打印，但里面什么也没有
//if(strcutNull == null)
//{
// 可以赋空值，但是不能判空？
// Assets / StructAndClass / StructAndClass.cs(99, 12): error CS0037: Cannot convert null to `SimpleTestStruct' because it is a value type
//}
strcutNull = new SimpleTestStruct();
Debug.Log(strcutNull.ToString()); // 默认赋值
strcutNull = null;
Debug.Log(strcutNull.ToString()); // 可以再次赋空值
// TODO 测试strcutNull大小
}
/// <summary>
/// 测试struct的构造函数
/// </summary>
private void TestStructConstructer()
{
TestStruct testConstructor; // 结构将不会被初始化，但是也不能访问。
//PrintTestStruct(testConstructor, "no new testConstructor"); // Assets/StructAndClass/StructAndClass.cs(80,19): error CS0165: Use of unassigned local variable `testConstructor'
testConstructor = new TestStruct();
//PrintTestStruct(testConstructor, "new testConstructor");
// 尚未初始化testClass
// NullReferenceException: Object reference not set to an instance of an object
// estStruct.ToString()(at Assets / StructAndClass / StructAndClass.cs:193)
// StructAndClass.PrintTestStruct(TestStruct info, System.String desc)(at Assets / StructAndClass / StructAndClass.cs:136)
// StructAndClass.TestValueStruct()(at Assets / StructAndClass / StructAndClass.cs:83)
// StructAndClass.Start()(at Assets / StructAndClass / StructAndClass.cs:15)
testConstructor = new TestStruct(new TestClass(100));
PrintTestStruct(testConstructor, "new testConstructor TestClass Param");
SimpleTestStruct simple = new SimpleTestStruct();
Debug.Log(simple.ToString()); // 默认赋值
}